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- W201616241 abstract "In this work, it has been shown that the temperature (ranging from 100 to 175 °C) greatly influences the performance of H 3 PO 4 -doped polybenzimidazole-based high-temperature polymer electrolyte membrane fuel cells by several and complex processes. The temperature, by itself, increases H 3 PO 4 -doped PBI conductivity and enhances the electrodic reactions as it rises. Nevertheless, high temperatures reduce the level of hydration of the membrane, above 130–140 °C accelerate the self-dehydration of H 3 PO 4 , and they may boost the process of catalyst particle agglomeration that takes place in strongly acidic H 3 PO 4 medium (as checked by multi-cycling sweep voltammetry), reducing the overall electrochemical active surface. The first process seems to have a rapid response to changes in the temperature and controls the cell performance immediately after them. The second process seems to develop slower, and influences the cell performance in the “long-term”. The predominant processes, at each moment and temperature, determine the effect of the temperature on the cell performance, as potentiostatic curves display. “Long-term” polarization curves grow up to 150 °C and decrease at 175 °C. “Short-term” ones continuously increase as the temperature does after “conditioning” the cell at 125 °C. On the contrary, when compared the polarization curves at 175 °C a continuous decrease is observed with the “conditioning” temperature. A discussion of the observed trends is proposed in this work." @default.
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- W201616241 date "2007-03-01" @default.
- W201616241 modified "2023-09-26" @default.
- W201616241 title "PBI-based polymer electrolyte membranes fuel cells" @default.
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- W201616241 doi "https://doi.org/10.1016/j.electacta.2006.11.014" @default.
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